*          Networks and Devices Using Planar Transmission Lines

Franco Di Paolo
CRC Press

657 pages; $129.95, £87.00
ISBN: 0-8493-1835-1

T he object of this book is to join in one text all of the practical information and physical principles that permit a planar transmission line device to work properly. The text is intended for microwave design engineers as well as students in this related field. The book is dedicated to the analysis of planar transmission lines and their related devices, such as directional couplers, directional filters, phase shifters, circulators and isolators.

Chapter 1 introduces the concepts and general theory of transmission lines, describing the four types: coupled wires, parallel plates, coaxial lines and waveguide. Chapter 2 is dedicated to microstrip networks that are widely used in planar devices. Chapter 3 covers stripline, probably the first planar microwave structure. Chapter 4 introduces the main problems that can be encountered in planar transmission line networks and devices such as discontinuities and higher order modes. Chapter 5 describes the coupled microstrip structure, while Chapter 6 covers the stripline counterpart. Chapter 7 introduces the most used microstrip devices, such as directional couplers and phase shifters, while Chapter 8 covers the stripline counterparts of these devices. Chapter 9 introduces the slotline, a transmission line with both conductors on the same plane. Chapter 10 deals with coplanar waveguide and describes the most important devices constructed using slotlines. The final chapter introduces coplanar strip transmission lines.

Much of this book's value resides in the extensive appendices. Subjects such as theoretical solution methods for simple electrostatic problems, and the most important concepts of wave theory are covered. External properties of networks and the concepts of resonant circuits are listed along with the physical relationships of charges, currents and magnetic fields. The magnetic properties of materials are listed and aspects of the electromagnetic field inside ferrimagnetic materials are presented. The book ends with a listing of symbols, definitions and useful relationships associated with the text.

To order this book, contact: CRC Press LLC, 2000 Corporate Blvd NW, Boca Raton, FL 33431, (561) 994-0555.  

* Neural Networks for RF and Microwave Design

Q.J. Zhang and K.C. Gupta
Artech House Inc.

369 pages plus CD ROM; $93, £64
ISBN: 1-58053-100-8

T he recent introduction of neural networks to the RF and microwave field offers an unconventional alternative to CAD modeling and design problems in RF and microwave. Neural network models are universal approximators allowing the reuse of the same modeling technology for both linear and nonlinear problems and at both device and circuit levels. This book describes neural networks from the point of view and in the language of RF and microwave engineers.

The first chapter provides an introduction to RF/microwave design and neural networks. Chapter 2 goes on to describe how RF and microwave problems relate to neural networks. The following two chapters describe various types of neural network structures and methods for training neural networks.

Artificial neural network (ANN) modeling of various types of RF and microwave components are discussed in Chapter 5. Examples such as transmission line structures, coplanar waveguide (CPW) circuit design and microstrip patch antennas are included. The use of ANN models for optimizing the geometry of these components is discussed. Chapter 6 describes ANN modeling of interconnects used in high speed digital and RF/microwave circuits. The development of small-signal and large-signal models for various active devices, such as FETs, HBTs and HEMTs is the topic of Chapter 7. Chapter 8 describes how to incorporate neural network models in circuit simulation and design. Examples of optimization of CPW circuits, patch antennas, multilayer filters and amplifiers are included. Chapter 9 deals with combining prior RF and microwave knowledge with neural networks leading to a methodology for knowledge-based circuit design. The final chapter provides a summary of the concepts and discusses some emerging trends for future research and development in this field.

To aid in putting ANN concepts into practice, an introductory version of NeuroModeler software is included. Appendix A provides a brief instruction for using the software.

To order this book, contact: Artech House Inc., 685 Canton St., Norwood, MA 02062 (781) 769-9750, ext. 4002; or 46 Gillingham St., London SW1V 1HH, UK +44 (0)20 7596-8750.